Whether or not you agree with the idea of R2P, it should be noted that at the conclusion of her War of the Gods with Ares, Diana chose not to intervene in further wars between men, and instead decided her best option was to love humanity from behind the scenes. She only emerged again to fight the extraterrestrial menace of the Kryptonian, Doomsday, in Batman vs Superman, a century later. So the critique of this article has missed the entire upshot of the film, which largely agrees with the author.